JEE Main 202124 Feb, Evening shiftPhysicsMediumOscillations and Waves185× since 2002
Two cars are approaching each other at an equal speed of 7.2 km/hr. When they see each other, both blow horns having frequency of 676 Hz. The beat frequency heard by each driver will be ___________ Hz. [Velocity of sound in air is 340 m/s.]